Grinder for rotary cloth-cutting machines



1 g "I" (1:111 I I i KQ'XIlNH I In tl ll jlui i 7M. ZAWISTOWSKI GRINDER FOR ROTARY CLOTH CUTTING MACHINES.

APPLICATlON FILED on so. 1919.

2 SHEETSSHEET I- Patefited J 11110 1, 1920.

M. ZAWISTOWSKI.

GRINDER FOR ROTARX CLOTH CUTTING MACH INES.

APPLICATION FILED OCT 30, 1919.

1,341,699. PatentediTune 1,1920.

2 SHEETS-SHEET 2.

s? v \HIIIHE mm IA/l/E/VTOR A TTOR/VEY- UNITED STATES PATENT OFFICE.

MARTIN ZAWIS TOWSKI," OF BROOKLYN, NEW YORK.

Application filed October 30, 1919. Serial No.

To all whom it may concern:

Be it known that I, MARTIN ZAwIs'r'ow- SKI, a citizen of the United States, and a, resident of Brooklyn, in the county of Kmgs ing action. The main objects of my invention are to rigidly secure the stones to the hubs or bearing blocks, to facilitate the replacement of the stones when they are worn or broken, by new ones and without the use of tools other than an ordinary screw driver, and to facilitate the. adjustment of the stones axially to provide the desired clearance.

As an important feature of my invention I provide hub members freely rotatable upon a spindle and each including a pair of sections between which a portion of the corresponding stone ma be rigidly clamped. As another important eature of my.invention, I provide supports for the spindle which are adjustable toward and from each other and may engage with the hubs or bearing blocks of the stones to provide the adjustment of the latter. The preferred embodiment hereinafter described also embodies other important features defined in the appended claims. In the accompanying drawings to which reference is to be had: Figure 1 is a side view of a rotarycloth cutting machine constructed substantially as shown in my prior Patent No. 1,319,809, issued October 28th, 1919, and-in connection with which I empIoy my improved grinder construction Fig. 2 is a front view of the parts shown in Fig. 1, t he guard being displaced and the grinder in operative posltion;

I Fig. 3 is a plan view of the grinder and grinder carrier;

Fig. 4 is a sectional detail on the line 44- of Fig. 3, but on a larger scale; and

Fig. 5 is a perspective yiewof the several parts in spaced relationship.

I have illustrated my improved grinder as mounted upon a machine having a standard 10 carried by-a base 11 and supporting a rotary knife 12 which may be driven Specification of Letters iaterit.

end of this pin may have a coile therethrouglh GRINDER FOR ROTARY CLOTH-CUTTIN G MACHINES.

Patented une 1, 1920.

through suitable gears from an electric motor, only the base 13 of which is illustrated. The frame, at a point above the.

lmife, carries a transversely extending rack bar 14: engaging with a pinion 15 and supporting a knife guard 16. which carries the pinion also has a grooved wheel 18 upon which a flexible member 19 may wind or unwind. The frame, at a oint above the knife, has a forwardly extending lug 20 upon which is pivoted the grinder carrier 21. This has a pair of lugs 22-22 for engagement with opposite sides of the lug 20 and permitting the pivotal support: ing of the. grinder carrier by a pivot in 23 extending through the three lu S. no

spring The Shaft 17 24 for normally holding'the grinder carrier in raised position as shown in Fig. 1. Rigidly secured to or integral with one of the lugs 22 is a grooved wheel 25 upon which the flexible member 19 may wind or unwind and to'the periphery of which is secured one end of the flexible member. By

rotating the shaft 17 the rack bar is moved endwiseto push the guard away from the knife and the flexible member 19 is wound on the grooved wheel 18 and unwound from the grooved wheel 25% as to thereby swing the grinder downwardly from the position shown in Fig. 1 to the position .shown in.

1 2. k In my improved construction of grinder carrier the member 21 has apair of arms 26 with registering apertures at an angle to the general direction of the pivot pin 23. Within these apertures are secured two screw threaded plugs 27 and 28, one of which has a spindle 29 rigidly secured thereto and the other has an axial passage within which the free end. of the s indle may extend and whereby the plug- 2? acts as a'guideand support from said free end.

Rotatably mounted upon the spindle between the two arms 26 are a pairof hub members 30. Eachv has a central passage 4 receiving the spindle upon which the ub members may rotate. Each hub member has a peripheral flange at its outer end presenting a shoulder, the body portion of the hub being of such size as to closely fit in thecentral aperture of the annular grinderstone 32. .The stone has an inwardl extending flange 33 at its outer .end WhlCh fits on to the'body portion of the hub and against the flange 31. Within the central chamber or'cavity of the grinder stone is a plate 34 adapted to fit against the inner surface of the flange 33, this plate being of larger diameter than the body portion of thehub 30. The plate is rigidly secured to the hub by two or more screws 35 so as to bind the stone between the plate 34: and the flange 31 and rigidly secure it to the hub.

The two stones and their respective hubs are the same in construction-but face in opposite directions so that the two stones present spaced annular grinding surfaces between which the edge of the knife *may be inserted. .A coiled spring 36 encircles the spindle 29 between the two hubs and presses against the two plates 34: to tend to spread the stones apart to the maximum distance. The outer ends of the hubs abut against the inner ends of the two plugs 27 and 28 so that by the rotation of these plugs the stones may be forced toward each other and the spring correspondingly compressed. The

' grinder stones rotatably mounted on said stones may both be adjusted in the same direction so as to bring the slot in position so as to properly register with the knife, by the rotation of the plugs 27 and 28 in the same direction. As the operative faces of the stones wear away the plugs may be adjusted toward each other to restore the desired spacing of said operative faces and the proper engagement with the opposite sides of the knife edge. The tilting ofthe axis of the-stones in respect to the axis of the knife causes the knife to enter the slot at an angle and one stone engage with one tion of new grinder stones at any time without the use of any tools other than ascrew driver and in a very few minutes. The stones are freely rotatable, except for the friction produced by the spring and are secured to their hubs in such a way that they are not liable to loosen in use. To look the plugs 27 and 28 against rotation after the desired adjustment is secured, the arms 28 may have slots extending inwardly to the plug apertures as shown in Fig. 1 and the slotted portions forced together by a set screw 37 to grip the plugs.

- Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A inder for rotary cloth cutting machines Including a spindle normally held This permits the inserincluding a pivoted grinder carrier including a pair of spaced arms, a pair of plugs threaded to said arms, a spindle carried by one plug and rotatably mounted within the other, a pair of grinder stones rotatably mounted on said spindle between said arms and a coiled spring between said stones tending to spread them apart, said plugs being axially adjustable to limit the separation of the stones.

3. A grinder for rotary cloth cutting machines including a movable carrier having a pair of spaced arms, a pair of plugs threaded in said arms in alinement with each other, a spindle carried by one plug and journaled in the other and a pair of spindle.

4. A grinder for rotary cloth cutting machines including a pair of spaced parts, a pair of plugs threaded in said parts in alinement with each other, a spindle carried by one plug and projecting into the other and a pair of grinder stones rotatably mounted on said spindle, said plugs being adjustable toward and from each other to vary the spacing "of said plugs.

5. A grinder for rotary cloth cutting machines including a support, a pair of members having threaded engagement therewith and spaced apart in axial alinement, a spindle carried by said members and normally held against rotation, a pair of hubs independently, and freely rotatable on said spindle, grinder stones carried by said hubs, re-

.silient means for spacing said hubs apart and holding them in engagement with said threaded members, said members being adjustable toward and from each other for varying the maximum spacing of said hubs.

6. A grinder for rotary cloth cutting machines including a spindle normally held against rotation, a pair of hubs independently rotatable thereon, grinder stones rigidly secured to said hubs, resilient means spacing said hubs, and stops at opposite sides of said hubs and adjustable toward and from each other to vary the maximum spacing of said hubs.

7 A grinder for rotary cloth cutting machines including a spindle, a pair of independently rotatable hubs thereon, grinder stones rigidly secured to said hubs, resilient means tending to separate said stones, and separate-independently adjustable stops for limiting the separation of said stones.

8. A grinder for rotary cloth cutting machines including a spindle, a pair of hubs mounted thereon, each hub having a body each grinder stone facing toward the other portion presenting a peripheral flange at grinder stone whereby said hubs are spaced one end, a grinder stone encircling the body apart along said spindle, and means for efportion of each hub and including a cylinfecting the adjustment of said hubs toward 5 drical laterally facing flange encircling a each other as the opposed faces of the 15 central chamber, a plate detachably secured grinder stones wear away in use. directly to the body portion of each hub Signed at New York, in the county of within the chamber and serving to clamp New York and State of New York this 28th the corresponding stone against the peday of October, A. D. 1919.

10 ripheral flange of thehub, the flange of 'A MARTIN ZAWISTOWSKI. 

